US10124629B2 - Pneumatic tire with sipe activation boosters - Google Patents

Pneumatic tire with sipe activation boosters Download PDF

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Publication number
US10124629B2
US10124629B2 US14/522,966 US201414522966A US10124629B2 US 10124629 B2 US10124629 B2 US 10124629B2 US 201414522966 A US201414522966 A US 201414522966A US 10124629 B2 US10124629 B2 US 10124629B2
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Prior art keywords
channels
tread
sipe
trapezoidal
rectangular
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US14/522,966
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US20160114631A1 (en
Inventor
Frédéric Michel-Jean Pons
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Goodyear Tire and Rubber Co
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Goodyear Tire and Rubber Co
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Priority to US14/522,966 priority Critical patent/US10124629B2/en
Assigned to GOODYEAR TIRE & RUBBER COMPANY, THE reassignment GOODYEAR TIRE & RUBBER COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PONS, FRÉDÉRIC MICHEL-JEAN
Priority to EP15189417.7A priority patent/EP3012120B1/en
Publication of US20160114631A1 publication Critical patent/US20160114631A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C2011/133—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising recesses

Definitions

  • the present invention relates to a pneumatic tire with improved gripping force on a frozen road surface or a snow covered road surface.
  • grooves may be microscopically formed by using a short fiber-containing foamed rubber as a tread rubber and breaking away the short fibers exposed on a surface of the tread accompanied with the wearing of the tread rubber during the normal operation.
  • the microscopic grooves formed on the tread may be crushed as a load applied to the tire becomes large, and hence the effect of increasing the friction coefficient on the ice-snow road surface may not be sufficiently obtained.
  • the short fibers may be embedded in a foamed rubber at a state of extending in a straight line and substantially in parallel to a worn face of the tread. Thus, when the tread is worn, the short fibers exposed on the worn face of the tread may rapidly break away and degrade traction.
  • the short fibers may actually and frequently be embedded in the foamed rubber at a state of being curled through heat shrinkage in the vulcanization or pushing of the fibers into a groove portion of a mold part or a sipe portion to bend in the tread rubber.
  • the short fibers substantially parallel to the worn face of the tread cannot easily be broken away from the foamed rubber, so that the microscopic grooves as originally intended cannot function efficiently.
  • tread rubber may contain closed spherical cells. Ice or snow may thaw to water by friction heat when the tread contacts the ice-snow road surface. This water may form a water membrane between the tread and the ice-snow road surface thereby deteriorating ice and/or snow performance. In this case, the water membrane may be partially negated by the action of irregularities on the tread formed by the closed spherical cells. Often, this method does not develop the sufficient water-removing effect because the irregularities formed on the tread by the closed cells may be very small.
  • This water/ice/snow removing effect has been enhanced by many continuous closed cells covered with a protection layer of a resin. These continuous closed cells may form ejection paths whereby water/ice/snow may be removed from the tread contact surface.
  • a tread for a pneumatic tire in accordance with the present invention includes a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end, a sipe extending laterally adjacent the second ends of the trapezoidal channels, and a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe.
  • each block of the tread contains the plurality of trapezoidal channels, the sipe, and the plurality of rectangular channels.
  • a pneumatic tire in accordance with the present invention includes a pair of annular, inextensible beads, a carcass ply extending between the beads, and a tread extending circumferentially around a radially outermost portion of the carcass ply, the tread including at least one tread block, the tread block including a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end, a sipe extending laterally adjacent the second ends of the trapezoidal channels, and a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe.
  • FIG. 1 is a schematic orthogonal view of a tire tread in accordance with the present invention.
  • FIG. 2 is a schematic perspective/sectional view of the functioning of the tire tread of FIG. 1 .
  • sipes may be used in winter tire tread designs to enhance the snow performance of pneumatic tires.
  • Block edges of the tread may be increased for improving snow grip.
  • increased block edges necessitates an increase in sipes, grooves, and/or spaces where snow may become captured and defeat the purpose of the increased block edges.
  • the tread blocks may be staggered in order to decouple the sipes, grooves, and/or spaces and prevent snow from remaining in the sipes, grooves, and/or spaces.
  • One example conventional winter tread is disclosed by U.S. Pat. No. 8,757,229, herein incorporated in its entirety by reference.
  • Trapezoidal circumferential channels 20 may operate to feed snow to a transverse sipe 30 extending perpendicularly to the rotation direction 35 of the tread 10 . These trapezoidal circumferential channels 20 extend in the rotation direction 35 thereby allowing snow to enter at the wider end 25 .
  • These channels 20 may alternatively have a rectangular shape when viewed radially into the tread 10 .
  • the channels 20 may have a circular, a square, a rectangular, and/or a trapezoidal shape when view in cross-section in the rotation direction 35 .
  • the sipe 30 may join the trapezoidal channels to rectangular circumferential channels 40 that are axially, or transversely, staggered relative to the trapezoidal channels 20 .
  • the two rows of channels 20 , 40 may located on a single tread block 15 .
  • the trapezoidal channels 20 may “open-up” the sipe 30 when the pneumatic tire is rotating at a constant speed or accelerating ( FIG. 2 ).
  • the rectangular channels 40 may “open-up” the sipe 30 when pneumatic tire is decelerating, or braking ( FIG. 2 ).
  • tread 10 allows increased and quicker snow jam into the sipe 30 by generating a more efficient sipe opening 32 and an increase in snow performance of the pneumatic tire. Due to this greater efficiency of the sipe 30 , sipe depths may be reduced to increase overall tread pattern stiffness (e.g., ride and handling improvement).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

A tread for a pneumatic tire includes a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end, a sipe extending laterally adjacent the second ends of the trapezoidal channels, and a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe.

Description

FIELD OF THE INVENTION
The present invention relates to a pneumatic tire with improved gripping force on a frozen road surface or a snow covered road surface.
BACKGROUND OF THE INVENTION
In conventional pneumatic tires, particularly studless winter tires, various conventional methods attempt to improve performance on ice or snow. As a way for increasing a friction coefficient on an ice-snow road surface, grooves may be microscopically formed by using a short fiber-containing foamed rubber as a tread rubber and breaking away the short fibers exposed on a surface of the tread accompanied with the wearing of the tread rubber during the normal operation.
However, the microscopic grooves formed on the tread may be crushed as a load applied to the tire becomes large, and hence the effect of increasing the friction coefficient on the ice-snow road surface may not be sufficiently obtained. Also, the short fibers may be embedded in a foamed rubber at a state of extending in a straight line and substantially in parallel to a worn face of the tread. Thus, when the tread is worn, the short fibers exposed on the worn face of the tread may rapidly break away and degrade traction.
The short fibers may actually and frequently be embedded in the foamed rubber at a state of being curled through heat shrinkage in the vulcanization or pushing of the fibers into a groove portion of a mold part or a sipe portion to bend in the tread rubber. In this case, even if the tread is worn during the running, the short fibers substantially parallel to the worn face of the tread cannot easily be broken away from the foamed rubber, so that the microscopic grooves as originally intended cannot function efficiently.
Another conventional method for ensuring acceptable performance on ice or snow, tread rubber may contain closed spherical cells. Ice or snow may thaw to water by friction heat when the tread contacts the ice-snow road surface. This water may form a water membrane between the tread and the ice-snow road surface thereby deteriorating ice and/or snow performance. In this case, the water membrane may be partially negated by the action of irregularities on the tread formed by the closed spherical cells. Often, this method does not develop the sufficient water-removing effect because the irregularities formed on the tread by the closed cells may be very small.
This water/ice/snow removing effect has been enhanced by many continuous closed cells covered with a protection layer of a resin. These continuous closed cells may form ejection paths whereby water/ice/snow may be removed from the tread contact surface.
SUMMARY OF THE INVENTION
A tread for a pneumatic tire in accordance with the present invention includes a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end, a sipe extending laterally adjacent the second ends of the trapezoidal channels, and a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe.
According to another aspect of the tread, each block of the tread contains the plurality of trapezoidal channels, the sipe, and the plurality of rectangular channels.
A pneumatic tire in accordance with the present invention includes a pair of annular, inextensible beads, a carcass ply extending between the beads, and a tread extending circumferentially around a radially outermost portion of the carcass ply, the tread including at least one tread block, the tread block including a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end, a sipe extending laterally adjacent the second ends of the trapezoidal channels, and a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention, which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages thereof, may best be understood by making reference to the following description, taken in conjunction with the accompanying drawings, in the several figures of which like reference numerals identify identical elements, wherein:
FIG. 1 is a schematic orthogonal view of a tire tread in accordance with the present invention.
FIG. 2 is a schematic perspective/sectional view of the functioning of the tire tread of FIG. 1.
 DESCRIPTION OF AN EXAMPLE OF THE PRESENT INVENTION
As shown in FIG. 1, sipes may be used in winter tire tread designs to enhance the snow performance of pneumatic tires. Block edges of the tread may be increased for improving snow grip. However, increased block edges necessitates an increase in sipes, grooves, and/or spaces where snow may become captured and defeat the purpose of the increased block edges. In accordance with the present invention, the tread blocks may be staggered in order to decouple the sipes, grooves, and/or spaces and prevent snow from remaining in the sipes, grooves, and/or spaces. One example conventional winter tread is disclosed by U.S. Pat. No. 8,757,229, herein incorporated in its entirety by reference.
One example tread 10 in accordance with present invention is shown in FIG. 1. Trapezoidal circumferential channels 20 may operate to feed snow to a transverse sipe 30 extending perpendicularly to the rotation direction 35 of the tread 10. These trapezoidal circumferential channels 20 extend in the rotation direction 35 thereby allowing snow to enter at the wider end 25. These channels 20 may alternatively have a rectangular shape when viewed radially into the tread 10. The channels 20 may have a circular, a square, a rectangular, and/or a trapezoidal shape when view in cross-section in the rotation direction 35. The sipe 30 may join the trapezoidal channels to rectangular circumferential channels 40 that are axially, or transversely, staggered relative to the trapezoidal channels 20. The two rows of channels 20, 40 may located on a single tread block 15. The trapezoidal channels 20 may “open-up” the sipe 30 when the pneumatic tire is rotating at a constant speed or accelerating (FIG. 2). The rectangular channels 40 may “open-up” the sipe 30 when pneumatic tire is decelerating, or braking (FIG. 2).
This functioning of the tread 10 allows increased and quicker snow jam into the sipe 30 by generating a more efficient sipe opening 32 and an increase in snow performance of the pneumatic tire. Due to this greater efficiency of the sipe 30, sipe depths may be reduced to increase overall tread pattern stiffness (e.g., ride and handling improvement).
While the present invention has been particularly shown and described with reference to particular examples thereof, it will be understood by those skilled in the art that various changes may be made and equivalents substituted for elements thereof without departing from the broad scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from the recited scope thereof. Therefore, it is intended that the present invention not be limited to the particular examples disclosed herein, but that the present invention may include all examples falling within the scope of the appended claims.

Claims (3)

What is claimed:
1. A tread for a pneumatic tire comprising:
a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end;
a sipe extending laterally adjacent the second ends of the trapezoidal channels; and
a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe,
the sipe being circumferentially aligned with both the second ends of the trapezoidal channels and the first ends of the rectangular channels.
2. The tread as set forth in claim 1 wherein the each block of the tread contains the plurality of trapezoidal channels, the sipe, and the plurality of rectangular channels.
3. A pneumatic tire comprising:
a pair of annular, inextensible beads;
a carcass ply extending between the beads; and
a tread extending circumferentially around a radially outermost portion of the carcass ply, the tread including at least one tread block, the tread block including:
a plurality of trapezoidal channels, each trapezoidal channel extending circumferentially from a first end to a second end, the first end being wider than the second end;
a sipe extending laterally adjacent the second ends of the trapezoidal channels; and
a plurality of rectangular channels, each rectangular channel extending circumferentially from a first end to a second end, the first ends of the rectangular channels being adjacent the sipe,
the sipe being circumferentially aligned with both the second ends of the trapezoidal channels and the first ends of the rectangular channels.
US14/522,966 2014-10-24 2014-10-24 Pneumatic tire with sipe activation boosters Active 2037-02-04 US10124629B2 (en)

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US14/522,966 US10124629B2 (en) 2014-10-24 2014-10-24 Pneumatic tire with sipe activation boosters
EP15189417.7A EP3012120B1 (en) 2014-10-24 2015-10-12 Pneumatic tire with sipe activation boosters

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Application Number Priority Date Filing Date Title
US14/522,966 US10124629B2 (en) 2014-10-24 2014-10-24 Pneumatic tire with sipe activation boosters

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US20160114631A1 US20160114631A1 (en) 2016-04-28
US10124629B2 true US10124629B2 (en) 2018-11-13

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JP2019104409A (en) * 2017-12-13 2019-06-27 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic tire

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122879A (en) 1976-03-24 1978-10-31 Bridgestone Tire Company Limited Heavy duty pneumatic radial tire
JPH061119A (en) 1992-06-22 1994-01-11 Yokohama Rubber Co Ltd:The Pneumatic tire for iced and snowy road
JPH0616016A (en) 1992-07-01 1994-01-25 Bridgestone Corp Pneumatic tire
US6026875A (en) 1996-12-06 2000-02-22 Continental Aktiengesellschaft Vehicle tire with a tread exhibiting sipes substantially running in the axial direction
US6378583B1 (en) 2000-02-28 2002-04-30 The Goodyear Tire & Rubber Company Heel and toe wear balancing
US6382283B1 (en) 1998-12-23 2002-05-07 Pirelli Pneumatici S.P.A. Tire for vehicle wheels including sipes
US6430993B1 (en) 1998-09-07 2002-08-13 Bridgestone Corporation Method of estimating tire performance
US6564625B1 (en) 1999-10-25 2003-05-20 Bridgestone Corporation Method of designing a tire, method of designing a vulcanizing mold for a tire, method of making a vulcanizing mold for a tire, method of manufacturing a pneumatic tire, and recording medium with tire designing program recorded thereon
US6575215B1 (en) 1999-11-05 2003-06-10 Sumitomo Rubber Industries, Ltd. Studless tire including tread comprising short fibers
US6866076B2 (en) 2000-02-07 2005-03-15 Bridgestone Corporation Tire having longitudinally extending smaller grooves formed in the walls of a groove
US7306019B2 (en) 2001-09-28 2007-12-11 Bridgestone Corporation Pneumatic tire including toriodally continuous cells and method of producing same
US20090101260A1 (en) 2007-10-23 2009-04-23 The Yokohama Rubber Co., Ltd. Pneumatic tire
US7954527B2 (en) 2006-08-31 2011-06-07 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having both end closed groove bottom concave portions and both end open groove bottom sipes
US8261789B2 (en) 2007-10-25 2012-09-11 Continental Tire North America, Inc. Tire tread having three different sipe types
US8511357B2 (en) 2007-02-14 2013-08-20 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having main grooves and sipes
US8757229B2 (en) 2010-10-29 2014-06-24 The Goodyear Tire & Rubber Company Winter tire center tread pattern

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122879A (en) 1976-03-24 1978-10-31 Bridgestone Tire Company Limited Heavy duty pneumatic radial tire
JPH061119A (en) 1992-06-22 1994-01-11 Yokohama Rubber Co Ltd:The Pneumatic tire for iced and snowy road
JPH0616016A (en) 1992-07-01 1994-01-25 Bridgestone Corp Pneumatic tire
US6026875A (en) 1996-12-06 2000-02-22 Continental Aktiengesellschaft Vehicle tire with a tread exhibiting sipes substantially running in the axial direction
US6430993B1 (en) 1998-09-07 2002-08-13 Bridgestone Corporation Method of estimating tire performance
US6382283B1 (en) 1998-12-23 2002-05-07 Pirelli Pneumatici S.P.A. Tire for vehicle wheels including sipes
US6564625B1 (en) 1999-10-25 2003-05-20 Bridgestone Corporation Method of designing a tire, method of designing a vulcanizing mold for a tire, method of making a vulcanizing mold for a tire, method of manufacturing a pneumatic tire, and recording medium with tire designing program recorded thereon
US6575215B1 (en) 1999-11-05 2003-06-10 Sumitomo Rubber Industries, Ltd. Studless tire including tread comprising short fibers
US6866076B2 (en) 2000-02-07 2005-03-15 Bridgestone Corporation Tire having longitudinally extending smaller grooves formed in the walls of a groove
US6378583B1 (en) 2000-02-28 2002-04-30 The Goodyear Tire & Rubber Company Heel and toe wear balancing
US7306019B2 (en) 2001-09-28 2007-12-11 Bridgestone Corporation Pneumatic tire including toriodally continuous cells and method of producing same
US7954527B2 (en) 2006-08-31 2011-06-07 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having both end closed groove bottom concave portions and both end open groove bottom sipes
US8511357B2 (en) 2007-02-14 2013-08-20 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having main grooves and sipes
US20090101260A1 (en) 2007-10-23 2009-04-23 The Yokohama Rubber Co., Ltd. Pneumatic tire
US8261789B2 (en) 2007-10-25 2012-09-11 Continental Tire North America, Inc. Tire tread having three different sipe types
US8757229B2 (en) 2010-10-29 2014-06-24 The Goodyear Tire & Rubber Company Winter tire center tread pattern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
European Search Report dated Mar. 8,2016 for Application Serial No. EP15189417.

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Publication number Publication date
EP3012120B1 (en) 2018-07-04
US20160114631A1 (en) 2016-04-28
EP3012120A1 (en) 2016-04-27

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